imgui_impl_glfw, imgui_impl_sdl: Workaround for Emscripten which doesn't seem to handle focus related calls. (#1941)

Author: ocornut

examples/imgui_impl_glfw.cpp

@@ -14,6 +14,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
 //  2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
 //  2018-06-08: Misc: Extracted imgui_impl_glfw.cpp/.h away from the old combined GLFW+OpenGL/Vulkan examples.
 //  2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
@@ -199,7 +200,12 @@ static void ImGui_ImplGlfw_UpdateMousePosAndButtons()
     // Update mouse position
     const ImVec2 mouse_pos_backup = io.MousePos;
     io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
-    if (glfwGetWindowAttrib(g_Window, GLFW_FOCUSED))
+#ifdef __EMSCRIPTEN__
+    const bool focused = true; // Emscripten
+#else
+    const bool focused = glfwGetWindowAttrib(g_Window, GLFW_FOCUSED) != 0;
+#endif
+    if (focused)
     {
         if (io.WantSetMousePos)
         {

examples/imgui_impl_sdl.cpp

@@ -15,6 +15,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
 //  2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
 //  2018-06-08: Misc: Extracted imgui_impl_sdl.cpp/.h away from the old combined SDL2+OpenGL/Vulkan examples.
 //  2018-06-08: Misc: ImGui_ImplSDL2_InitForOpenGL() now takes a SDL_GLContext parameter. 
@@ -214,7 +215,7 @@ static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
     io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
     g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
 
-#if SDL_HAS_CAPTURE_MOUSE
+#if SDL_HAS_CAPTURE_MOUSE && !defined(__EMSCRIPTEN__)
     SDL_Window* focused_window = SDL_GetKeyboardFocus();
     if (g_Window == focused_window)
     {